Transition intensities between excited states of rare earth ions in crystals

Polarization characteristics of the most intense two-photon transitions of rare-earth ions in crystals

Transfer of Excitation from the Crystal Lattice to Rare Earth Ions

Investigation of the Mechanism of the Elementary Act of Excitation-energy Transfer Between Rare-earth Ions in Crystals

Selective excitation of rare-earth ion centers in crystals

On excitation transfer from a host crystal to rare earth ions

Multiphonon sideband intensities in rare earth ions in crystal